/*
 * Copyright (C) 2011 Christopher Probst
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of the 'FoxNet AIO' nor the names of its 
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.foxnet.aio.impl;

import java.io.IOException;
import java.nio.channels.AsynchronousChannel;
import java.util.concurrent.atomic.AtomicReference;

import com.foxnet.aio.Event;
import com.foxnet.aio.EventHandler;
import com.foxnet.aio.EventQueue;
import com.foxnet.aio.impl.QueueWorker.QueueRunnable;

/**
 * @author Christopher Probst
 */
public class EventQueueImpl<C extends AsynchronousChannel> implements
	EventQueue<C> {

    final C channel;
    final QueueWorker worker;
    final AtomicReference<EventHandler<C>> atomicHandler =
	    new AtomicReference<EventHandler<C>>();

    public EventQueueImpl(C channel, QueueWorker worker) {
	this.channel = channel;
	this.worker = worker;
    }

    /*
     * (non-Javadoc)
     * @see com.foxnet.aio.AsynchronousEventQueue#getChannel()
     */
    @Override
    public C getChannel() {
	return channel;
    }

    /*
     * (non-Javadoc)
     * @see java.io.Closeable#close()
     */
    @Override
    public void close() throws IOException {

    }

    /*
     * (non-Javadoc)
     * @see
     * com.foxnet.aio.AsynchronousEventQueue#setEventHandler(com.foxnet.aio.
     * AsynchronousEventHandler)
     */
    @Override
    public EventHandler<C> setEventHandler(EventHandler<C> eventHandler) {
	return atomicHandler.getAndSet(eventHandler);
    }

    /*
     * (non-Javadoc)
     * @see com.foxnet.aio.AsyncEventQueue#getEventHandler()
     */
    @Override
    public EventHandler<C> getEventHandler() {
	return atomicHandler.get();
    }

    /*
     * (non-Javadoc)
     * @see com.foxnet.aio.AsynchronousEventQueue#postEvent(com.foxnet.aio.
     * AsynchronousEvent)
     */
    @Override
    public void postEvent(Event event) {
	worker.queue.offer(new QueueRunnable<C>(this, event));
    }
}
